Martin Logan reQuests vs newer Martin Logan offerings

If you keep the panels vacuumed, they should last for years. As a last resort, you can pull the panels and wash them. (See Martin Logan's Owner Site).

So their limited lifespan is mainly related to dust accumulation? Or is it something related to repeated micro - arching (due to dust particles) identifiable by the typical low level buzz noises sometimes heard when putting your ear next to the charged panel when no music is playing?  How often is it OK to vacuum them? (I\m doing it every 2 months or so; I wouldn't mind doing more often if this would prolong their life)

I vacuum my Summit Xs, ReQuests, and Stage speakers every 2-3 months. I don't think it would be beneficial to vacuum any more. I've never experienced any arcing or buzzing noises in the 15 years I've had electrostatics.I bought the ReQuests used, so they are older than that.

Thanks!